int git_worktree_add()

in src/worktree.c [280:404]

• 97 lines of code
• 36 McCabe index (conditional complexity)

int git_worktree_add(git_worktree **out, git_repository *repo,
	const char *name, const char *worktree,
	const git_worktree_add_options *opts)
{
	git_buf gitdir = GIT_BUF_INIT, wddir = GIT_BUF_INIT, buf = GIT_BUF_INIT;
	git_reference *ref = NULL, *head = NULL;
	git_commit *commit = NULL;
	git_repository *wt = NULL;
	git_checkout_options coopts = GIT_CHECKOUT_OPTIONS_INIT;
	git_worktree_add_options wtopts = GIT_WORKTREE_ADD_OPTIONS_INIT;
	int err;

	GIT_ERROR_CHECK_VERSION(
		opts, GIT_WORKTREE_ADD_OPTIONS_VERSION, "git_worktree_add_options");

	if (opts)
		memcpy(&wtopts, opts, sizeof(wtopts));

	assert(out && repo && name && worktree);

	*out = NULL;

	if (wtopts.ref) {
		if (!git_reference_is_branch(wtopts.ref)) {
			git_error_set(GIT_ERROR_WORKTREE, "reference is not a branch");
			err = -1;
			goto out;
		}

		if (git_branch_is_checked_out(wtopts.ref)) {
			git_error_set(GIT_ERROR_WORKTREE, "reference is already checked out");
			err = -1;
			goto out;
		}
	}

	/* Create gitdir directory ".git/worktrees/<name>" */
	if ((err = git_buf_joinpath(&gitdir, repo->commondir, "worktrees")) < 0)
		goto out;
	if (!git_path_exists(gitdir.ptr))
		if ((err = git_futils_mkdir(gitdir.ptr, 0755, GIT_MKDIR_EXCL)) < 0)
			goto out;
	if ((err = git_buf_joinpath(&gitdir, gitdir.ptr, name)) < 0)
		goto out;
	if ((err = git_futils_mkdir(gitdir.ptr, 0755, GIT_MKDIR_EXCL)) < 0)
		goto out;
	if ((err = git_path_prettify_dir(&gitdir, gitdir.ptr, NULL)) < 0)
		goto out;

	/* Create worktree work dir */
	if ((err = git_futils_mkdir(worktree, 0755, GIT_MKDIR_EXCL)) < 0)
		goto out;
	if ((err = git_path_prettify_dir(&wddir, worktree, NULL)) < 0)
		goto out;

	if (wtopts.lock) {
		int fd;

		if ((err = git_buf_joinpath(&buf, gitdir.ptr, "locked")) < 0)
			goto out;

		if ((fd = p_creat(buf.ptr, 0644)) < 0) {
			err = fd;
			goto out;
		}

		p_close(fd);
		git_buf_clear(&buf);
	}

	/* Create worktree .git file */
	if ((err = git_buf_printf(&buf, "gitdir: %s\n", gitdir.ptr)) < 0)
		goto out;
	if ((err = write_wtfile(wddir.ptr, ".git", &buf)) < 0)
		goto out;

	/* Create gitdir files */
	if ((err = git_path_prettify_dir(&buf, repo->commondir, NULL) < 0)
	    || (err = git_buf_putc(&buf, '\n')) < 0
	    || (err = write_wtfile(gitdir.ptr, "commondir", &buf)) < 0)
		goto out;
	if ((err = git_buf_joinpath(&buf, wddir.ptr, ".git")) < 0
	    || (err = git_buf_putc(&buf, '\n')) < 0
	    || (err = write_wtfile(gitdir.ptr, "gitdir", &buf)) < 0)
		goto out;

	/* Set up worktree reference */
	if (wtopts.ref) {
		if ((err = git_reference_dup(&ref, wtopts.ref)) < 0)
			goto out;
	} else {
		if ((err = git_repository_head(&head, repo)) < 0)
			goto out;
		if ((err = git_commit_lookup(&commit, repo, &head->target.oid)) < 0)
			goto out;
		if ((err = git_branch_create(&ref, repo, name, commit, false)) < 0)
			goto out;
	}

	/* Set worktree's HEAD */
	if ((err = git_repository_create_head(gitdir.ptr, git_reference_name(ref))) < 0)
		goto out;
	if ((err = git_repository_open(&wt, wddir.ptr)) < 0)
		goto out;

	/* Checkout worktree's HEAD */
	coopts.checkout_strategy = GIT_CHECKOUT_FORCE;
	if ((err = git_checkout_head(wt, &coopts)) < 0)
		goto out;

	/* Load result */
	if ((err = git_worktree_lookup(out, repo, name)) < 0)
		goto out;

out:
	git_buf_dispose(&gitdir);
	git_buf_dispose(&wddir);
	git_buf_dispose(&buf);
	git_reference_free(ref);
	git_reference_free(head);
	git_commit_free(commit);
	git_repository_free(wt);

	return err;
}